Re: [PATCH] sha2-256 truncation

[Michal Ludvig <michal@xxxxxxxx>]

Michal Ludvig told me that:

> the attached trivial patch corrects the truncation size of computed 
> hashes that are used in IPsec ESP/AH packets for SHA2-256. All other 
> hash algorithms use 96 bits as well as does SuperFreeS/WAN and FreeBSD 
> also for SHA2-256. Only the native Linux sha2-256 used 128 bits what led 
>  to incompatibility with other IPsec implementations.

Oops, sorry. I sent a reversed patch originally. Please use this one 
instead.

Michal Ludvig
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--- linux-2.6.0/net/xfrm/xfrm_algo.c    2004-01-08 01:29:52.067261651 +0100
+++ linux-2.6.0.orig/net/xfrm/xfrm_algo.c       2004-01-08 01:28:38.668690081 
+0100
@@ -85,7 +85,7 @@ static struct xfrm_algo_desc aalg_list[]
 
        .uinfo = {
                .auth = {
-                       .icv_truncbits = 128,
+                       .icv_truncbits = 96,
                        .icv_fullbits = 256,
                }
        },